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Complement-mediated serum bactericidal antibody responses of mice immunized with recombinant factor H binding protein (fHbp) vaccines ID 1 (A) or ID 55 (B) measured against each the 7 isogenic mutant strains. Each symbol represents the reciprocal titer of a serum pool (3 per vaccine group; 4 mice per pool); the horizontal lines represent the reciprocal geometric mean titers.
